public class Example8_14 {
    public static void main(String args[]) {
        StringBuffer str=new StringBuffer();
        str.append("大家好");
        System.out.println("str:"+str);
        System.out.println("length:"+str.length());
        System.out.println("capacity:"+str.capacity());
        str.setCharAt(0 ,'w');
        str.setCharAt(1 ,'e');
        System.out.println(str);
        str.insert(2, " are all");
        System.out.println(str);
        int index=str.indexOf("好");
        str.replace(index,str.length()," right");
        System.out.println(str);
    }
}


